(1-x)K_(0.48)Na_(0.52)NbO_3-xBi_(0.45)Nd_(0.05)(Na_(0.92)Li_(0.08))_(0.5)ZrO_3无铅压电陶瓷相结构及压电性能  

Phase Structure and Piezoelectric Property of (1–x)K_(0.48)Na_(0.52)NbO_3-xBi_(0.45)Nd_(0.05)(Na_(0.92)Li_(0.08))_(0.5)ZrO_3 Lead-free Piezoceramics

作　　者：赵林[1] 马健[1] 张俊[1] 吴波 肖定全[3] 

机构地区：[1]西南民族大学电气信息工程学院,成都610041 [2]成都信息工程大学,信息材料及器件化应用四川省高校重点实验室,成都610225 [3]四川大学材料科学与工程学院,成都610064

出　　处：《无机材料学报》2018年第1期87-92,共6页Journal of Inorganic Materials

基　　金：西南民族大学中央高校基本科研业务费专项资金项目(2015NZYQN48)~~

摘　　要：为了在获得较高压电性能的同时又不大大降低陶瓷的居里温度(TC),设计和制备了Bi_(0.45)Nd_(0.05)(Na_(0.92)-Li_(0.08))_(0.5)ZrO_3改性的K_(0.48)Na_(0.52)NbO_3系无铅压电陶瓷((1–x)KNN-xBNNLZ),研究了BNNLZ含量对KNN基无铅压电陶瓷相结构和电学性能的影响。研究结果表明,所有陶瓷样品均具有较高的居里温度T_C(>300℃)。随着BNNLZ含量的增加,陶瓷的正交-四方相变温度(T_(O-T))不断向低温方向移动,而三方–正交相变温度(T_(R-O))不断向高温方向移动,最终在陶瓷中形成了三方–四方(R-T)共存相,R-T共存相处于0.05<x<0.07范围。BNNLZ的加入引起陶瓷相结构的演化改变导致压电常数(d_(33))、介电常数(ε_r)、剩余极化强度(Pr)和机电耦合系数(k_p)都先增大后减小,当x=0.06时陶瓷具有最佳压电性能:d_(33)=313 pC/N,k_p=42%,P_r=25.48μC/cm^2,ε_r=1353,tanδ=2.5%,T_C=327℃。To enhance the piezoelectric properties and maintain relatively higher Curie temperature （TC）, （1-x）K0.48 Na0.52 NbO3-x Bi0.45 Nd0.05 （Na0.92Li0.08）0.5ZrO3 （（1-x） KNN-xBNNLZ） ceramics were prepared by conventional solid-state method. The effects of BNNLZ content on the phase structure and electrical properties of the ceramics were investigated in details. The results show that all ceramic samples exhibit higher TC （〉300℃）. With the increase of BNNLZ content, both orthorhombic-tetragonal phase transition temperature （TO-T） and rhombohedral-orthorhombic phase transition temperatures （TR-O） shift to room temperature simultaneously, and finally the R-T phase coexistence is constructed near room temperature in the compositions range of 0.05〈x〈0.07. The phase transitions of the ceramics caused by BNNLZ addition lead to values of d33, εr, Pr, and kp increase firstly and then decrease. The ceramic with x=0.06 exhibits optimal properties： d33=313 pC/N, kp=42%, Pr=25.48 μC/cm2, εr=1353, tanδ=2.5%, together with a higher TC of 327℃.

关 键 词：KNN 压电性能 相界构建 

分 类 号：TM221[一般工业技术—材料科学与工程]